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Salvadora grahamiae
About 1 meter long. (3 feet)
Shrub vegetation on a hill.
I almost step on it. It wasn´t moving.
Thank you Ashley for the ID and the link. This snake and the rattle snakes are always present in this mountain range.
Maybe Thamnophis proximus rutiloris, Mexican ribbonsnake or Thamnophis eques, Mexican gartersnake.